cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/keyboard/lkkbd.c

/*
 *  Copyright (C) 2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
 */

/*
 * LK keyboard driver for Linux, based on sunkbd.c (C) by Vojtech Pavlik
 */

/*
 * DEC LK201 and LK401 keyboard driver for Linux (primary for DECstations
 * and VAXstations, but can also be used on any standard RS232 with an
 * adaptor).
 *
 * DISCLAIMER: This works for _me_. If you break anything by using the
 * information given below, I will _not_ be liable!
 *
 * RJ10 pinout:         To DE9:         Or DB25:
 *      1 - RxD <---->  Pin 3 (TxD) <-> Pin 2 (TxD)
 *      2 - GND <---->  Pin 5 (GND) <-> Pin 7 (GND)
 *      4 - TxD <---->  Pin 2 (RxD) <-> Pin 3 (RxD)
 *      3 - +12V (from HDD drive connector), DON'T connect to DE9 or DB25!!!
 *
 * Pin numbers for DE9 and DB25 are noted on the plug (quite small:). For
 * RJ10, it's like this:
 *
 *      __=__   Hold the plug in front of you, cable downwards,
 *     /___/|   nose is hidden behind the plug. Now, pin 1 is at
 *    |1234||   the left side, pin 4 at the right and 2 and 3 are
 *    |IIII||   in between, of course:)
 *    |    ||
 *    |____|/
 *      ||      So the adaptor consists of three connected cables
 *      ||      for data transmission (RxD and TxD) and signal ground.
 *              Additionally, you have to get +12V from somewhere.
 * Most easily, you'll get that from a floppy or HDD power connector.
 * It's the yellow cable there (black is ground and red is +5V).
 *
 * The keyboard and all the commands it understands are documented in
 * "VCB02 Video Subsystem - Technical Manual", EK-104AA-TM-001. This
 * document is LK201 specific, but LK401 is mostly compatible. It comes
 * up in LK201 mode and doesn't report any of the additional keys it
 * has. These need to be switched on with the LK_CMD_ENABLE_LK401
 * command. You'll find this document (scanned .pdf file) on MANX,
 * a search engine specific to DEC documentation. Try
 * http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/workqueue.h>


#define DRIVER_DESC	"LK keyboard driver"

MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>");

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Known parameters:
 *      bell_volume
 *      keyclick_volume
 *      ctrlclick_volume
 *
 * Please notice that there's not yet an API to set these at runtime.
 */

static int bell_volume = 100; 
/* % */
module_param(bell_volume, int, 0);
MODULE_PARM_DESC(bell_volume, "Bell volume (in %). default is 100%");


static int keyclick_volume = 100; 
/* % */
module_param(keyclick_volume, int, 0);
MODULE_PARM_DESC(keyclick_volume, "Keyclick volume (in %), default is 100%");


static int ctrlclick_volume = 100; 
/* % */
module_param(ctrlclick_volume, int, 0);
MODULE_PARM_DESC(ctrlclick_volume, "Ctrlclick volume (in %), default is 100%");


static int lk201_compose_is_alt;
module_param(lk201_compose_is_alt, int, 0);
MODULE_PARM_DESC(lk201_compose_is_alt,
		 "If set non-zero, LK201' Compose key will act as an Alt key");




#undef LKKBD_DEBUG
#ifdef LKKBD_DEBUG

#define DBG(x...) printk(x)
#else

#define DBG(x...) do {} while (0)
#endif

/* LED control */

#define LK_LED_WAIT		0x81

#define LK_LED_COMPOSE		0x82

#define LK_LED_SHIFTLOCK	0x84

#define LK_LED_SCROLLLOCK	0x88

#define LK_CMD_LED_ON		0x13

#define LK_CMD_LED_OFF		0x11

/* Mode control */

#define LK_MODE_DOWN		0x80

#define LK_MODE_AUTODOWN	0x82

#define LK_MODE_UPDOWN		0x86

#define LK_CMD_SET_MODE(mode, div)	((mode) | ((div) << 3))

/* Misc commands */

#define LK_CMD_ENABLE_KEYCLICK	0x1b

#define LK_CMD_DISABLE_KEYCLICK	0x99

#define LK_CMD_DISABLE_BELL	0xa1

#define LK_CMD_SOUND_BELL	0xa7

#define LK_CMD_ENABLE_BELL	0x23

#define LK_CMD_DISABLE_CTRCLICK	0xb9

#define LK_CMD_ENABLE_CTRCLICK	0xbb

#define LK_CMD_SET_DEFAULTS	0xd3

#define LK_CMD_POWERCYCLE_RESET	0xfd

#define LK_CMD_ENABLE_LK401	0xe9

#define LK_CMD_REQUEST_ID	0xab

/* Misc responses from keyboard */

#define LK_STUCK_KEY		0x3d

#define LK_SELFTEST_FAILED	0x3e

#define LK_ALL_KEYS_UP		0xb3

#define LK_METRONOME		0xb4

#define LK_OUTPUT_ERROR		0xb5

#define LK_INPUT_ERROR		0xb6

#define LK_KBD_LOCKED		0xb7

#define LK_KBD_TEST_MODE_ACK	0xb8

#define LK_PREFIX_KEY_DOWN	0xb9

#define LK_MODE_CHANGE_ACK	0xba

#define LK_RESPONSE_RESERVED	0xbb


#define LK_NUM_KEYCODES		256

#define LK_NUM_IGNORE_BYTES	6


static unsigned short lkkbd_keycode[LK_NUM_KEYCODES] = {
	[0x56] = KEY_F1,
	[0x57] = KEY_F2,
	[0x58] = KEY_F3,
	[0x59] = KEY_F4,
	[0x5a] = KEY_F5,
	[0x64] = KEY_F6,
	[0x65] = KEY_F7,
	[0x66] = KEY_F8,
	[0x67] = KEY_F9,
	[0x68] = KEY_F10,
	[0x71] = KEY_F11,
	[0x72] = KEY_F12,
	[0x73] = KEY_F13,
	[0x74] = KEY_F14,
	[0x7c] = KEY_F15,
	[0x7d] = KEY_F16,
	[0x80] = KEY_F17,
	[0x81] = KEY_F18,
	[0x82] = KEY_F19,
	[0x83] = KEY_F20,
	[0x8a] = KEY_FIND,
	[0x8b] = KEY_INSERT,
	[0x8c] = KEY_DELETE,
	[0x8d] = KEY_SELECT,
	[0x8e] = KEY_PAGEUP,
	[0x8f] = KEY_PAGEDOWN,
	[0x92] = KEY_KP0,
	[0x94] = KEY_KPDOT,
	[0x95] = KEY_KPENTER,
	[0x96] = KEY_KP1,
	[0x97] = KEY_KP2,
	[0x98] = KEY_KP3,
	[0x99] = KEY_KP4,
	[0x9a] = KEY_KP5,
	[0x9b] = KEY_KP6,
	[0x9c] = KEY_KPCOMMA,
	[0x9d] = KEY_KP7,
	[0x9e] = KEY_KP8,
	[0x9f] = KEY_KP9,
	[0xa0] = KEY_KPMINUS,
	[0xa1] = KEY_PROG1,
	[0xa2] = KEY_PROG2,
	[0xa3] = KEY_PROG3,
	[0xa4] = KEY_PROG4,
	[0xa7] = KEY_LEFT,
	[0xa8] = KEY_RIGHT,
	[0xa9] = KEY_DOWN,
	[0xaa] = KEY_UP,
	[0xab] = KEY_RIGHTSHIFT,
	[0xac] = KEY_LEFTALT,
	[0xad] = KEY_COMPOSE, /* Right Compose, that is. */
	[0xae] = KEY_LEFTSHIFT, /* Same as KEY_RIGHTSHIFT on LK201 */
	[0xaf] = KEY_LEFTCTRL,
	[0xb0] = KEY_CAPSLOCK,
	[0xb1] = KEY_COMPOSE, /* Left Compose, that is. */
	[0xb2] = KEY_RIGHTALT,
	[0xbc] = KEY_BACKSPACE,
	[0xbd] = KEY_ENTER,
	[0xbe] = KEY_TAB,
	[0xbf] = KEY_ESC,
	[0xc0] = KEY_1,
	[0xc1] = KEY_Q,
	[0xc2] = KEY_A,
	[0xc3] = KEY_Z,
	[0xc5] = KEY_2,
	[0xc6] = KEY_W,
	[0xc7] = KEY_S,
	[0xc8] = KEY_X,
	[0xc9] = KEY_102ND,
	[0xcb] = KEY_3,
	[0xcc] = KEY_E,
	[0xcd] = KEY_D,
	[0xce] = KEY_C,
	[0xd0] = KEY_4,
	[0xd1] = KEY_R,
	[0xd2] = KEY_F,
	[0xd3] = KEY_V,
	[0xd4] = KEY_SPACE,
	[0xd6] = KEY_5,
	[0xd7] = KEY_T,
	[0xd8] = KEY_G,
	[0xd9] = KEY_B,
	[0xdb] = KEY_6,
	[0xdc] = KEY_Y,
	[0xdd] = KEY_H,
	[0xde] = KEY_N,
	[0xe0] = KEY_7,
	[0xe1] = KEY_U,
	[0xe2] = KEY_J,
	[0xe3] = KEY_M,
	[0xe5] = KEY_8,
	[0xe6] = KEY_I,
	[0xe7] = KEY_K,
	[0xe8] = KEY_COMMA,
	[0xea] = KEY_9,
	[0xeb] = KEY_O,
	[0xec] = KEY_L,
	[0xed] = KEY_DOT,
	[0xef] = KEY_0,
	[0xf0] = KEY_P,
	[0xf2] = KEY_SEMICOLON,
	[0xf3] = KEY_SLASH,
	[0xf5] = KEY_EQUAL,
	[0xf6] = KEY_RIGHTBRACE,
	[0xf7] = KEY_BACKSLASH,
	[0xf9] = KEY_MINUS,
	[0xfa] = KEY_LEFTBRACE,
	[0xfb] = KEY_APOSTROPHE,
};


#define CHECK_LED(LK, VAR_ON, VAR_OFF, LED, BITS) do {            \
        if (test_bit(LED, (LK)->dev->led))                      \
                VAR_ON |= BITS;                                 \
        else                                                    \
                VAR_OFF |= BITS;                                \
        } while (0)

/*
 * Per-keyboard data
 */

struct lkkbd {
	
unsigned short keycode[LK_NUM_KEYCODES];
	
int ignore_bytes;
	
unsigned char id[LK_NUM_IGNORE_BYTES];
	
struct input_dev *dev;
	
struct serio *serio;
	
struct work_struct tq;
	
char name[64];
	
char phys[32];
	
char type;
	
int bell_volume;
	
int keyclick_volume;
	
int ctrlclick_volume;
};

#ifdef LKKBD_DEBUG
/*
 * Responses from the keyboard and mapping back to their names.
 */
static struct {
	
unsigned char value;
	
unsigned char *name;
} 
lk_response[] = {

#define RESPONSE(x) { .value = (x), .name = #x, }
	RESPONSE(LK_STUCK_KEY),
	RESPONSE(LK_SELFTEST_FAILED),
	RESPONSE(LK_ALL_KEYS_UP),
	RESPONSE(LK_METRONOME),
	RESPONSE(LK_OUTPUT_ERROR),
	RESPONSE(LK_INPUT_ERROR),
	RESPONSE(LK_KBD_LOCKED),
	RESPONSE(LK_KBD_TEST_MODE_ACK),
	RESPONSE(LK_PREFIX_KEY_DOWN),
	RESPONSE(LK_MODE_CHANGE_ACK),
	RESPONSE(LK_RESPONSE_RESERVED),

#undef RESPONSE
};


static unsigned char *response_name(unsigned char value) { int i; for (i = 0; i < ARRAY_SIZE(lk_response); i++) if (lk_response[i].value == value) return lk_response[i].name; return "<unknown>"; }

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#endif /* LKKBD_DEBUG */ /* * Calculate volume parameter byte for a given volume. */
static unsigned char volume_to_hw(int volume_percent) { unsigned char ret = 0; if (volume_percent < 0) volume_percent = 0; if (volume_percent > 100) volume_percent = 100; if (volume_percent >= 0) ret = 7; if (volume_percent >= 13) /* 12.5 */ ret = 6; if (volume_percent >= 25) ret = 5; if (volume_percent >= 38) /* 37.5 */ ret = 4; if (volume_percent >= 50) ret = 3; if (volume_percent >= 63) /* 62.5 */ ret = 2; /* This is the default volume */ if (volume_percent >= 75) ret = 1; if (volume_percent >= 88) /* 87.5 */ ret = 0; ret |= 0x80; return ret; }

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static void lkkbd_detection_done(struct lkkbd *lk) { int i; /* * Reset setting for Compose key. Let Compose be KEY_COMPOSE. */ lk->keycode[0xb1] = KEY_COMPOSE; /* * Print keyboard name and modify Compose=Alt on user's request. */ switch (lk->id[4]) { case 1: strlcpy(lk->name, "DEC LK201 keyboard", sizeof(lk->name)); if (lk201_compose_is_alt) lk->keycode[0xb1] = KEY_LEFTALT; break; case 2: strlcpy(lk->name, "DEC LK401 keyboard", sizeof(lk->name)); break; default: strlcpy(lk->name, "Unknown DEC keyboard", sizeof(lk->name)); printk(KERN_ERR "lkkbd: keyboard on %s is unknown, please report to " "Jan-Benedict Glaw <jbglaw@lug-owl.de>\n", lk->phys); printk(KERN_ERR "lkkbd: keyboard ID'ed as:"); for (i = 0; i < LK_NUM_IGNORE_BYTES; i++) printk(" 0x%02x", lk->id[i]); printk("\n"); break; } printk(KERN_INFO "lkkbd: keyboard on %s identified as: %s\n", lk->phys, lk->name); /* * Report errors during keyboard boot-up. */ switch (lk->id[2]) { case 0x00: /* All okay */ break; case LK_STUCK_KEY: printk(KERN_ERR "lkkbd: Stuck key on keyboard at %s\n", lk->phys); break; case LK_SELFTEST_FAILED: printk(KERN_ERR "lkkbd: Selftest failed on keyboard at %s, " "keyboard may not work properly\n", lk->phys); break; default: printk(KERN_ERR "lkkbd: Unknown error %02x on keyboard at %s\n", lk->id[2], lk->phys); break; } /* * Try to hint user if there's a stuck key. */ if (lk->id[2] == LK_STUCK_KEY && lk->id[3] != 0) printk(KERN_ERR "Scancode of stuck key is 0x%02x, keycode is 0x%04x\n", lk->id[3], lk->keycode[lk->id[3]]); }

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/* * lkkbd_interrupt() is called by the low level driver when a character * is received. */
static irqreturn_t lkkbd_interrupt(struct serio *serio, unsigned char data, unsigned int flags) { struct lkkbd *lk = serio_get_drvdata(serio); struct input_dev *input_dev = lk->dev; unsigned int keycode; int i; DBG(KERN_INFO "Got byte 0x%02x\n", data); if (lk->ignore_bytes > 0) { DBG(KERN_INFO "Ignoring a byte on %s\n", lk->name); lk->id[LK_NUM_IGNORE_BYTES - lk->ignore_bytes--] = data; if (lk->ignore_bytes == 0) lkkbd_detection_done(lk); return IRQ_HANDLED; } switch (data) { case LK_ALL_KEYS_UP: for (i = 0; i < ARRAY_SIZE(lkkbd_keycode); i++) input_report_key(input_dev, lk->keycode[i], 0); input_sync(input_dev); break; case 0x01: DBG(KERN_INFO "Got 0x01, scheduling re-initialization\n"); lk->ignore_bytes = LK_NUM_IGNORE_BYTES; lk->id[LK_NUM_IGNORE_BYTES - lk->ignore_bytes--] = data; schedule_work(&lk->tq); break; case LK_METRONOME: case LK_OUTPUT_ERROR: case LK_INPUT_ERROR: case LK_KBD_LOCKED: case LK_KBD_TEST_MODE_ACK: case LK_PREFIX_KEY_DOWN: case LK_MODE_CHANGE_ACK: case LK_RESPONSE_RESERVED: DBG(KERN_INFO "Got %s and don't know how to handle...\n", response_name(data)); break; default: keycode = lk->keycode[data]; if (keycode != KEY_RESERVED) { input_report_key(input_dev, keycode, !test_bit(keycode, input_dev->key)); input_sync(input_dev); } else { printk(KERN_WARNING "%s: Unknown key with scancode 0x%02x on %s.\n", __FILE__, data, lk->name); } } return IRQ_HANDLED; }

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static void lkkbd_toggle_leds(struct lkkbd *lk) { struct serio *serio = lk->serio; unsigned char leds_on = 0; unsigned char leds_off = 0; CHECK_LED(lk, leds_on, leds_off, LED_CAPSL, LK_LED_SHIFTLOCK); CHECK_LED(lk, leds_on, leds_off, LED_COMPOSE, LK_LED_COMPOSE); CHECK_LED(lk, leds_on, leds_off, LED_SCROLLL, LK_LED_SCROLLLOCK); CHECK_LED(lk, leds_on, leds_off, LED_SLEEP, LK_LED_WAIT); if (leds_on != 0) { serio_write(serio, LK_CMD_LED_ON); serio_write(serio, leds_on); } if (leds_off != 0) { serio_write(serio, LK_CMD_LED_OFF); serio_write(serio, leds_off); } }

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static void lkkbd_toggle_keyclick(struct lkkbd *lk, bool on) { struct serio *serio = lk->serio; if (on) { DBG("%s: Activating key clicks\n", __func__); serio_write(serio, LK_CMD_ENABLE_KEYCLICK); serio_write(serio, volume_to_hw(lk->keyclick_volume)); serio_write(serio, LK_CMD_ENABLE_CTRCLICK); serio_write(serio, volume_to_hw(lk->ctrlclick_volume)); } else { DBG("%s: Deactivating key clicks\n", __func__); serio_write(serio, LK_CMD_DISABLE_KEYCLICK); serio_write(serio, LK_CMD_DISABLE_CTRCLICK); } }

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/* * lkkbd_event() handles events from the input module. */
static int lkkbd_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) { struct lkkbd *lk = input_get_drvdata(dev); switch (type) { case EV_LED: lkkbd_toggle_leds(lk); return 0; case EV_SND: switch (code) { case SND_CLICK: lkkbd_toggle_keyclick(lk, value); return 0; case SND_BELL: if (value != 0) serio_write(lk->serio, LK_CMD_SOUND_BELL); return 0; } break; default: printk(KERN_ERR "%s(): Got unknown type %d, code %d, value %d\n", __func__, type, code, value); } return -1; }

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/* * lkkbd_reinit() sets leds and beeps to a state the computer remembers they * were in. */
static void lkkbd_reinit(struct work_struct *work) { struct lkkbd *lk = container_of(work, struct lkkbd, tq); int division; /* Ask for ID */ serio_write(lk->serio, LK_CMD_REQUEST_ID); /* Reset parameters */ serio_write(lk->serio, LK_CMD_SET_DEFAULTS); /* Set LEDs */ lkkbd_toggle_leds(lk); /* * Try to activate extended LK401 mode. This command will * only work with a LK401 keyboard and grants access to * LAlt, RAlt, RCompose and RShift. */ serio_write(lk->serio, LK_CMD_ENABLE_LK401); /* Set all keys to UPDOWN mode */ for (division = 1; division <= 14; division++) serio_write(lk->serio, LK_CMD_SET_MODE(LK_MODE_UPDOWN, division)); /* Enable bell and set volume */ serio_write(lk->serio, LK_CMD_ENABLE_BELL); serio_write(lk->serio, volume_to_hw(lk->bell_volume)); /* Enable/disable keyclick (and possibly set volume) */ lkkbd_toggle_keyclick(lk, test_bit(SND_CLICK, lk->dev->snd)); /* Sound the bell if needed */ if (test_bit(SND_BELL, lk->dev->snd)) serio_write(lk->serio, LK_CMD_SOUND_BELL); }

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/* * lkkbd_connect() probes for a LK keyboard and fills the necessary structures. */
static int lkkbd_connect(struct serio *serio, struct serio_driver *drv) { struct lkkbd *lk; struct input_dev *input_dev; int i; int err; lk = kzalloc(sizeof(struct lkkbd), GFP_KERNEL); input_dev = input_allocate_device(); if (!lk || !input_dev) { err = -ENOMEM; goto fail1; } lk->serio = serio; lk->dev = input_dev; INIT_WORK(&lk->tq, lkkbd_reinit); lk->bell_volume = bell_volume; lk->keyclick_volume = keyclick_volume; lk->ctrlclick_volume = ctrlclick_volume; memcpy(lk->keycode, lkkbd_keycode, sizeof(lk->keycode)); strlcpy(lk->name, "DEC LK keyboard", sizeof(lk->name)); snprintf(lk->phys, sizeof(lk->phys), "%s/input0", serio->phys); input_dev->name = lk->name; input_dev->phys = lk->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_LKKBD; input_dev->id.product = 0; input_dev->id.version = 0x0100; input_dev->dev.parent = &serio->dev; input_dev->event = lkkbd_event; input_set_drvdata(input_dev, lk); __set_bit(EV_KEY, input_dev->evbit); __set_bit(EV_LED, input_dev->evbit); __set_bit(EV_SND, input_dev->evbit); __set_bit(EV_REP, input_dev->evbit); __set_bit(LED_CAPSL, input_dev->ledbit); __set_bit(LED_SLEEP, input_dev->ledbit); __set_bit(LED_COMPOSE, input_dev->ledbit); __set_bit(LED_SCROLLL, input_dev->ledbit); __set_bit(SND_BELL, input_dev->sndbit); __set_bit(SND_CLICK, input_dev->sndbit); input_dev->keycode = lk->keycode; input_dev->keycodesize = sizeof(lk->keycode[0]); input_dev->keycodemax = ARRAY_SIZE(lk->keycode); for (i = 0; i < LK_NUM_KEYCODES; i++) __set_bit(lk->keycode[i], input_dev->keybit); __clear_bit(KEY_RESERVED, input_dev->keybit); serio_set_drvdata(serio, lk); err = serio_open(serio, drv); if (err) goto fail2; err = input_register_device(lk->dev); if (err) goto fail3; serio_write(lk->serio, LK_CMD_POWERCYCLE_RESET); return 0; fail3: serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(lk); return err; }

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/* * lkkbd_disconnect() unregisters and closes behind us. */
static void lkkbd_disconnect(struct serio *serio) { struct lkkbd *lk = serio_get_drvdata(serio); input_get_device(lk->dev); input_unregister_device(lk->dev); serio_close(serio); serio_set_drvdata(serio, NULL); input_put_device(lk->dev); kfree(lk); }

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static struct serio_device_id lkkbd_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_LKKBD, .id = S